Someone was fired 47 meters from a cannon. What is th einital muzzle velocity of the cannon?

Am I supposed to assume max range which puts the cannon at 45deg?

As Siddharth said, you should post the question exactly as it was given. Just stated the way you gave it, it is impossible to answer because there is no information about the initial angle. Sometimes useful information is given using words instead of numbers so every word counts.